Beversiito



APPLICATION FlLED JUNE 3,1919.

E. AND S. W. LIPPITT.

REVERSING MECHANISM.

RENEWED 1uN 2s. 1921.

Patented Aug. 16, 1921.

IIYVENTORS ATTORNEYS.

er STATES 1. m;ew s;

' Emmi LIPPTTT ANns'rEPHEn w. meter, or CLEVELAND, OHIO.

niivnnsi re-irncimnisivi.

asasas.

Application filed June s, 1919, Serial meanness, Renewed tuners, 921. seriaruo. 180,453. I p

. To all whom it may concern:

Be it known that we, ELIHUVLIPPITT and "STEPHEN W. Lrrrrrr, citizens of the United I States, residing at Cleveland, in the county of Cuyahoga and State of Ohio,'have'i'n-' I vented certain new and useful Improvements in Reversing Mechanism and we do hereby declare the following to be a full, clear, and exact description of the invention,

such as will enable others skilled in the art I devices wherein a part is reciprocated back. and forth along a rectilinear path, the pr1n-.

cipal objects of the invention being the attainment of high speeds, and the minimizing f of the shocks which attend rapid reversals o'fthe motions of the reciprocating element. The invention will be fully understoodby referring to the accompanying drawings, in

which Figurel isa view ofthe device in elevap I J cam 17--has reached the'shockslide, 7, and

tion, certain of the parts being shown in section;

Fig. 2 is a similar plan view of the device;

Fig. 3 is an end elevation;

F1g4 is a view of the'traveling nut, and

upper walls.

Disposed within and fitting the bore 2 of the guide bar 1, is a cam shaft 6, having undercut or circular cam grooves, 6, 6", which cross each other at certain intervals. This shaft is sustained by the roller bearings 3 into which its reduced ends extend, said ends being screwed thereto at 6 These reduced ends each carry a separable shock slide 7, a coiled shock spring 8, an adjusting nut 9, and a jam nut 10, for said adjusting nut, the resistance of the spring being regulable by said adjusting nut 9. The adjusting nut.9, is provided with a conical recess 9, into which the conical slitted end 10*, of the jam nut extends, the object of these slits being to admit of the contraction of said end upon the screw threads 6 to thereby prevent retraction of said jam nut.

The shock slides 7, have-each an undercut reversing mechacam groove 7, which connects the cam,"-

Specification c eates mane. Patented Aug. 1e, 1921.

grooves 6 6 in order to establish their continuity,"and the cam shaft and each shock sllde 7, are interlocked by shoulders 6 7 which effectuate {theirunitary' operative relationship, although the separability of-saidshock slide admits of its renewal when the traveling n'ut, 1 1, is to bGlllSGI'ilGd in one of the cam grooves. 1 i

e'The'traveling nut 14; is carriedby a sliding block 13, which matches and slides with-' i'n'the slot 41 of the guide bar 1, said sliding blockbeing provided with 9.11016 13 within which the shank 15, of said traveling nut oscillates- .Said traveling nut is provided with a flange 16, and a 'cani 17, which inter-= locks withthe cam grooves 6", 6 the neck 17 of said'nut being of suchsize as to fit between the lips of said grooves The cam grooves 6 6', have three different pitches, the lesser pitch being toward the shock' block 7, the object being to secure a gradual decelerationof the reciprocating motion to oneehalf the center speed when the thus diminishthe shock, this result being slides 7.

The cam shaft is provided with a gear 12, at one end thereof which is driven by some other gear of the device. The cam shaft is -made to rotate at a constant speed causing the cam 17, and'the sliding block13, in which its shank 15, is pivoted, to follow the cam groove 6 or 6", until it reaches the cam groove 7?, of the shock block 7, through which said cam is transferred to the other cam groove, and the direction of its motion reversed. Although the speed of the cam and the sliding block'has greatly reduced before it enters said shock block, its momentum may be still such as to transmit shock to said slide block. These residual shocks will be taken by the proximate coiled shock spring 8, and thereby rendered substantially negligible.

When the device is installed in a knitting 'machine, the bore 2, of the guide bar will be disposed at a lower altitude than the open slot. 4 thereof, so that the unoccupied spaces therein may be filled with a lubricant.

this fact is of great importance since the output of the product is proportionate to the speed.

It will be understood that the sliding block 13, is to be attached to an operated element of a knitting or other machine in I which reproductions ofsaid element are deof said guide barand provided with crossed cam grooves of varying pitch, a'cam adapted to traverse said cam groove, and shock slides havingica'm grooves which unite said crossed cam grooves.

2. A reversing mechanism having a driven shaft, shock slides disposed at the ends of said shaft, said shaft and said shock slides being provided with a reversing cam groove,

and a cam associated with said cam groove.

3. A reversing mechanism comprising a guideway, a shaft journaled in parallelism with the guideway and provided with spiral grooves crossed at intervals throughout its length, extreme portions formed upon the ends of said shaft and movable axially rela tive thereto and containing continua-tions of the spiral grooves and yielding means for hold ng the sectlons in organized relation to the shaft.

4:. A reversing mechanism embodying a guideway, a shaft-journaled 1n parallelism with the guideway and composed of a plurality of axially movable parts, yielding means for holding the several parts in a unitary structure, said several parts embodying a spiral groove pitched in opposite directions and crossing at intervals, joining at the extremes in the movable parts of the shaft.

5. A reversing mechanism, comprising a guideway, a shaft journaled in parallelism with the guideway, movable parts forming continuations of the extremes of the shaft, springs adapted to hold the movable sections in engagement with the shaft, said shaft and movable extensions being provided with spiral grooves crossed at intervals and united at the ends in the movable sections, and a follower mounted to move in and follow the spiral grooves and move along the guideway.

6. A reversing mechanism comprising a guideway, a shaft journaled in parallelism with the guideway, and provided with independently movable extremes, springs for holding the extremes in unitary relation with the shaft, said shaft and extreme sections being provided with crossed spiral grooves united in the movable sections, a

member movable along the guideway, and a member fitted andmovable in the groove and carried by the member movably along the guideway.

In testimony whereof, we aflix our signatures.

ELIHU LIPPITT. STEPHEN W. LIPPITT. 

